mei_hbm_pg(9)

💅 mei_hbm_pg(9) — a little field guide

okay so real talk, this is a page out of the Kernel API Manual (yes, that's the whole manual name, it's giving very serious, very official 💼) and it's all about one tiny function: mei_hbm_pg. Sit with me bestie, this one's short and sweet 🍓

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✨ NAME ✨

mei_hbm_pg — it sends the pg command. that's it, that's the whole job. lowkey iconic for how unbothered it is 💅

🌸 SYNOPSIS 🌸

int mei_hbm_pg (struct mei_device *dev , u8 pg_cmd );

like, look at her. two lil params, one int coming back out. main character energy fr 👑

🎀 ARGUMENTS 🎀

• dev — the device structure. your whole device situation lives in here, she's the context bestie 🫶
• pg_cmd — the pg command code, typed as a u8. this is the actual instructions you're passing along, no cap ✨

⭐ RETURN ⭐

so here's what you can get back:

• -EIO — on write failure 😭 like, the write did not slay, it flopped
• -EOPNOTSUPP — if the operation is not supported by the protocol 🙈 the protocol said "not today" and honestly, respect

ngl bestie, if you see -EOPNOTSUPP it's not you, it's the protocol. don't take it personally 💀

🦋 SEE ALSO 🦋

the whole friend group shows up here, starting with the kernel file itself:

• ./drivers/misc/mei/hbm.c

and then the entire squad, in order, and yes we're listing every single one because nobody gets left behind 🥹:

• mei_cl_conn_status_to_errno(9)
• mei_hbm_write_message(9)
• mei_hbm_idle(9)
• mei_hbm_reset(9)
• mei_hbm_hdr(9)
• mei_hbm_cl_hdr(9)
• mei_hbm_cl_write(9)
• mei_hbm_cl_addr_equal(9)
• mei_hbm_cl_find_by_cmd(9)
• mei_hbm_start_wait(9)
• mei_hbm_start_req(9)
• mei_hbm_dma_setup_req(9)
• mei_hbm_capabilities_req(9)
• mei_hbm_enum_clients_req(9)
• mei_hbm_me_cl_add(9)
• mei_hbm_add_cl_resp(9)
• mei_hbm_fw_add_cl_req(9)
• mei_hbm_cl_notify_req(9)
• notify_res_to_fop(9)
• mei_hbm_cl_notify_start_res(9)
• mei_hbm_cl_notify_stop_res(9)
• mei_hbm_cl_notify(9)
• mei_hbm_cl_dma_map_req(9)
• mei_hbm_cl_dma_unmap_req(9)
• mei_hbm_prop_req(9)
• mei_hbm_stop_req(9)
• mei_hbm_cl_flow_control_req(9)
• mei_hbm_add_single_tx_flow_ctrl_creds(9)
• mei_hbm_cl_tx_flow_ctrl_creds_res(9)
• mei_hbm_cl_disconnect_req(9)
• mei_hbm_cl_disconnect_rsp(9)
• mei_hbm_cl_disconnect_res(9)
• mei_hbm_cl_connect_req(9)
• mei_hbm_cl_connect_res(9)
• mei_hbm_cl_res(9)
• mei_hbm_fw_disconnect_req(9)
• mei_hbm_pg_enter_res(9)
• mei_hbm_pg_resume(9)
• mei_hbm_pg_exit_res(9)
• mei_hbm_config_features(9)
• mei_hbm_version_is_supported(9)
• mei_hbm_dispatch(9)

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and that's the whole page babes, short king behavior 💜

sign-off time ✨ this one lives in ./drivers/misc/mei, it's dated October 2026, and the whole thing is filed under that Kernel API Manual we mentioned at the top. go read the source, drink some water, and stan a well-documented kernel function 🌈🎀